摘要
从储层渗透率和井底压力临界降速的角度对寿阳区块Q-H2井的3次排采中断造成的储层伤害进行了定量计算。3次排采中断造成煤储层渗透率分别从中断前的0.062mD、0.103mD和0.147mD下降到0.057mD、0.097mD和0.09mD,下降幅度分别为8.1%、5.8%和38.8%。3次排采中断使井底流压临界降速从初期的17.77kPa/d依次下降到11.63kPa/d、6.43kPa/d和4.97kPa/d,下降程度分别为34.6%、63.8%和72.0%,显示出本地区排采中断对储层造成的伤害非常明显。渗透率下降和井底流压临界降速被压缩对后期的产气潜力释放明显不利,也限制了后续排采管控的操作空间。排采中断的影响程度受中断时的压力状态、中断的时间和压力恢复程度、煤层本身的结构稳定性等多种因素影响。
Quantitative calculated the reservoir damage of the 3 drainage interruptions by the dynamic permeability and the BHP critical descending speed of Q-H2 well in ShouYang block.The permeability was down from 0.062、0.103 and 0.147 mD to 0.057、0.097 and 0.09 mD which declined 8.1%、5.8%and 38.8%for the 3 drainage interruptions.The BHP critical descending speed was down to 11.63、6.43 and 4.97 kPa/d from 17.77 kPa/d while the decline degree were separated 34.6%、63.8%and 72.0%,these indicates the huge damage of the drainage interruption for coal reservoir in this area.The decline of the dynamic permeability and the limit deceleration of downhole pressure are disadvantages for the release of production potential of this well,also limit the following operation space of the drainage controls seriously.The degree of the of influence of the drainage interruption are affected by the pressure,the time,the pressure recovery of the interruption and the structural stability of coal itself.
作者
张红军
王海侨
胡宇霆
韩军昌
ZHANG Hongjun;WANG Haiqiao;HU Yuting;HAN Junchang(China United Coalbed Methane Corporation Ltd,Beijing 100016)
出处
《中国煤层气》
2021年第3期6-10,共5页
China Coalbed Methane
基金
国家油气重大专项“弱含水叠置含气系统排采工艺技术研究”(2016ZX05044005-004)。
关键词
煤层气
排采中断
储层伤害
动态渗透率
Coalbed methane
drainage interruption
reservoir damage
dynamic permeability
